Folding Scalpel 2.0

At least for me, it is very common to design something that I think is pretty good only to redesign it later and then wish I hadn’t posted the earlier design. This is one of those. This folding scalpel pocket knife is very good IMHO. I made numerous design improvements that all resulted in simply a better knife.

Like the first version I released a month or so ago, this version is also a print-in-place design that requires no hardware, fasteners or adhesives. But what really makes this one so much better is…

  1. I made it slightly larger to accommodate the entire range of #4 handle scalpel blades. Including up to the 60A (or equivalent SwitchBack) blade. I have tested it with all the blades shown in the illustration below.
  2. This slightly larger design made it possible for me to strengthen the knife in many critical areas. And, as you know a few extra layers of print can really make a difference in strength and in this case, it has.
  3. The increased size and strength is complimented by an indexed spine mating with the blade side of the knife. This helps to reduce the side-to-side play in the knife.
  4. I created an offset of the radii in the pivot point. This is best understood by looking at the illustration below. I offset the internal radii so that in the print position there is a modest clearance of 0.5mm between the parts to ensure they do not fuse. But when the part is rotated 90 degrees the clearance is reduced to 0.3mm. This tightens the pivot at the fully open and closed positions. Creating a better feel and of course a better functionality.

Overall I feel this is a pretty good inexpensive and basically disposable/recyclable scalpel that I just might find myself using for a long time.

Printing

I have tried to make my main print settings visible on the Cura screenshot but in case they are difficult to read I have summarized them again here…

Screenshot

Material: I choose to use PETG for its durability and flexibility.

My Setup:
Nozzle = 0.4mm

My Settings:
Layer height = 0.2mm
Line width = 0.4mm
Wall count = 4 (1.6mm)
Infill = 40%
Ironing = ON

Support:
Designed to print without additional support. I have designed in one piece of support as shown in the accompanying illustration.

Print Orientation: As shown in the screenshot(s).

Assembly Notes

No assembly or post-print processing is required other than removing the one piece of support. Carefully break the blade end of the knife free by rotating back and forth on the pivot point. Install a scalpel blade.

Where to Get My STL Files

Thangs.com

I am now posting all of my new designs on Thangs.com and plan to continue to do so for the foreseeable future. Some of my older designs may not have been migrated over yet so if they are not available on Thangs.com please check on Thingiverse.

Use, Licensing, Comments and Feedback

My primary distribution site for my design files is Thangs.com. Thangs.com is, in my opinion, leading the way in promoting designers and competition amongst designers which in turn fuels the growth of high-quality 3d printable designs for the benefit of our entire community. However, as a result, some of my designs are only available for free for 1 week from when first posted, so please download them when you see a new file available that you are interested in. Also, please like and save to help me with the competitions.

I do not permit the use of my designs for commercial purposes (i.e. you can not sell my design(s) or products printed from my design(s)) without first acquiring a commercial license from me. On Thangs.com I offer membership accounts for access to all my design files as well as a membership for commercial licensing which allows subscribers to sell printed products using my designs.

I welcome comments and feedback as we as requests for customization of designs. I will do my best to accommodate those requests.


Comments

2 responses to “Folding Scalpel 2.0”

  1. Klaus Yde Avatar
    Klaus Yde

    I am not able to find your ver 2 stls files for your folding scalpel ‍♂️. They are not on Thangs. And ver1 are very difficult to open up. Just printed the 045 ver and it broke

    1. Paul Brock Avatar
      Paul Brock

      Hi, sorry, they should be there now. The new version should also be easier to open. Please let me know.
      https://than.gs/m/1092890

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